Quantitative Determination of Grain-Boundary Recombination Velocity in CdTe by Cathodoluminescence Measurements and Numerical Simulations

Ana Kanevce, John Moseley, Mowafak Al-Jassim, Wyatt Metzger

Research output: Contribution to journalArticlepeer-review

24 Scopus Citations

Abstract

We present a 2-D numerical model simulating cathodoluminescence (CL) measurements on CdTe. The model is used to analyze the impact of material parameters on the measured CL intensity to establish when grain-boundary (GB) recombination velocity SGB can be determined accurately from CL contrast. In addition to GB recombination, grain size and its ratio to the carrier diffusion length can impact CL measurements. Holding the grain interior and GB recombination rates constant, we find that as the grain size increases and exceeds the diffusion length, the observed CL contrast increases. For small-grain-size material, surface recombination lowers the overall intensity of the CL signal but does not significantly impact CL contrast. For large grains, high-surface recombination velocity can decrease the CL contrast. The model is combined with experimental results to quantify the SGB in polycrystalline CdTe before and after the CdCl2 treatment and to predict the impact of GB recombination on device performance.

Original languageAmerican English
Article number7295555
Pages (from-to)1722-1726
Number of pages5
JournalIEEE Journal of Photovoltaics
Volume5
Issue number6
DOIs
StatePublished - 1 Nov 2015

Bibliographical note

Publisher Copyright:
© 2011-2012 IEEE.

NREL Publication Number

  • NREL/JA-5J00-64372

Keywords

  • Cathodoluminescence
  • CdTe
  • grain boundaries
  • numerical simulations

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